Question about snake racks

Hey, guys. Getting ready to buy my first snake rack. I'm getting a 6 shelf rack that holds 2 15-quart tubs per shelf, and can later be switched to the 32-quart tubs as my snakes grow. My question is how big is too big for the 15 quart tubs?

Well i have never used a 15qt tub. We keep our hatchlings in a 6.5 qt tub until they reach about 400-500 grams then we bump them up to a 28qt tub. The bigger females are in a 32qt tub. We build all our racks so far so we keep the variance of tubs down to a minimum. You probably can keep a 1000 gram snake in a 15qt. Hope this helps.